A junior engineer is estimating the noise floor of a telemetry receiver whose…

PHYSICS · Multi-part · Fermi University Physics · Electronics, Instrumentation & Communication · Communication systems and RF engineering · Communication systems and RF engineering

Electronics for Measurement, Ch Modulation, receivers and the link that carries the measurement

Problem

A junior engineer is estimating the noise floor of a telemetry receiver whose transmitted bandwidth is

B = 12.5\,\mathrm{kHz}

and whose noise figure is

\mathrm{NF} = 8\,\mathrm{dB}

. The working submitted is: "

k_BT_0

at room temperature is

-174\,\mathrm{dBm/Hz}

. Adding the noise figure gives the receiver's noise floor directly:

-174\,\mathrm{dBm} + 8\,\mathrm{dB} = -166\,\mathrm{dBm}

." ((a)) Find the error in this working. ((b)) Give the correct noise floor in dBm, taking the noise-equivalent bandwidth equal to the transmitted bandwidth.

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